Investing's greatest concern...what's yours?

What's your greatest concern when it comes to investing?

1. Lack of return on your investments
2. Fear of loss, expecially from another 'bubble'
3. Lack of confidence regarding retirement
4. Global market volatility
5. Lost trust with an advisor and/or the financial services industry.

Feel free to share what you consider the number one concern regarding your current investments. 

Thanks in advance for your input.